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Breaking and Fixing Anonymous Credentials for the Cloud (Full Version)
Attribute-based credentials Privacy-preserving authentication Strong authentication
2019/9/23
In an attribute-based credential (ABC) system, users obtain a digital certificate on their personal attributes, and can later prove possession of such a certificate in an unlinkable way, thereby selec...
The customary formulation of authenticated encryption (AE) requires the decrypting party to supply the correct nonce with each ciphertext it decrypts. To enable this, the nonce is often sent in the cl...
HoneyBadgerMPC and AsynchroMix: Practical AsynchronousMPC and its Application to Anonymous Communication
multiparty computation robustness
2019/8/2
Multiparty computation as a service (MPSaaS) is a promising approach for building privacy-preserving communication systems.However, in this paper, we argue that existing MPC implementations are inadeq...
Simple and Efficient Approach for Achieving End-to-End Anonymous Communication
cryptographic protocols Anonymous communication
2019/7/15
Anonymous communication, that is secure end-to-end and unlinkable, plays a critical role in protecting user privacy by preventing service providers from using message metadata to discover communicatio...
Design of Anonymous Endorsement System in Hyperledger Fabric
Permissioned Blockchain Hyperledger Fabric Anonymous Endorsement System
2019/6/26
Permissioned Blockchain has become quite popular with enterprises forming consortium since it prioritizes trust over privacy. One of the popular platforms for distributed ledger solution, Hyperledger ...
Decentralized Multi-authority Anonymous Authentication for Global Identities with Non-interactive Proofs
anonymous authentication attribute collusion attack
2019/6/14
We propose a decentralized multi-authority anonymous authentication scheme in which a prover and a verifier are non-interactive. We give two security definitions; resistance against collusion attacks ...
A2L: Anonymous Atomic Locks for Scalability and Interoperability in Payment Channel Hubs
blockchain mixing bitcoin
2019/5/31
The striking growth in cryptocurrencies is revealing several scalability issues that go beyond the growing size of the blockchain. Payment channel hubs (PCHs) constitute a promising scalability soluti...
Fast Keyed-Verification Anonymous Credentials on Standard Smart Cards
Privacy anonymous credentials authentication
2019/5/13
Cryptographic anonymous credential schemes allow users to prove their personal attributes, such as age, nationality, or the validity of a ticket or a pre-paid pass, while preserving their privacy, as ...
Security Analysis of Efficient Anonymous Authentication With Conditional Privacy Preserving Scheme for Vehicular Ad Hoc Networks
Vehicular ad hoc networks (VANETs) Impersonation attack Bogus message attack
2019/5/13
Protecting a driver’s privacy is one of the major concerns in vehicular ad hoc networks (VANETs). Currently, Azees et al. has proposed an efficient anonymous authentication protocol (EAAP) for VANETs....
pRate: Anonymous Star Rating with Rating Secrecy
reputation management star rating anonymity
2019/4/16
We introduce pRate, a novel reputation management scheme with strong security and privacy guarantees for the users and their reputation scores. The reputation scores are computed based on the (aggrega...
Anonymous Deniable Identification in Ephemeral Setup & Leakage Scenarios
identification scheme ephemeral secret setting ephemeral secret leakage
2019/4/3
In this paper we concern anonymous identification, where the verifier can check that the user belongs to a given group of users (just like in case of ring signatures), however a transcript of a sessio...
Non-Interactive Keyed-Verification Anonymous Credentials
Anonymous credentials keyed-verification anonymous credentials non-interactive anonymous credentials
2019/2/27
Anonymous credential (AC) schemes are protocols which allow for authentication of authorized users without compromising their privacy. Of particular interest are non-interactive anonymous credential (...
Internet of Things (IoT) have seen tremendous growth and are being deployed pervasively in areas such as home, surveillance, health-care and transportation. These devices collect and process sensitive...
Updatable Anonymous Credentials and Applications to Incentive Systems
anonymity anonymous credentials incentive systems
2019/2/25
In this paper, we introduce updatable anonymous credential systems (UACS) and use them to construct a new privacy-preserving incentive system. In a UACS, a user holding a credential certifying some at...
BlAnC: Blockchain-based Anonymous and Decentralized Credit Networks
blockchain decentralized anonymity
2019/1/9
Distributed credit networks, such as Ripple and Stellar, are becoming popular as an alternative means for financial transactions. However, the current designs do not preserve user privacy or are not t...